Receipts and verification reference

A Receipt records action identity, idempotency key, type, time, outcome, optional artifact evidence, provider detail, operation ID, and trace ID. It states what the executor reports happened. A VerificationResult references the exact action and receipt, then records an independent official_api_readback or artifact_digest_reread, evidence, time, and result. It states what a separate observation found.

approved payload → effect command → claim → receipt → independent verification
                                           ↘ replay: already_applied

Verification must match receipt identity and artifact lineage. A receipt alone is not verification; a successful API response without a persisted receipt is not durable proof; a screenshot without identifiers is not replayable evidence. The vertical-slice validator in src/lib/verticalSliceEvidence.ts checks approval, command, claim, receipt, verification, trace, digest, and replay consistency. See Evidence runbook.

Integration reference

Workflow contracts

Evidence

Receipts and verification reference